Evaluate the Radical Function at the Given Value of the Variable

Multiple Choice

Evaluate the radical function at the given value of the variable.
- $$f ( x ) = \sqrt [ 5 ] { 2 x - 30 }$$

A) $( - \infty , \infty )$
B) $( - \infty , 15 )$
C) $[ 15 , \infty )$
D) $[ - 15 , \infty )$